<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar
      class="page-nav-bar"
      left-arrow
      title="黑马头条"
      @click-left="$router.back()"
    ></van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div class="loading-wrap" v-if="isLoading">
        <van-loading
          color="#3296fa"
          vertical
        >加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div class="article-detail" v-else-if="article.title">
        <!-- 文章标题 -->
        <h1 class="article-title">{{ article.title }}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image
            class="avatar"
            slot="icon"
            round
            fit="cover"
            :src="article.aut_photo"
          />
          <div slot="title" class="user-name">{{ article.aut_name }}</div>
          <div slot="label" class="publish-date">{{ article.pubdate | relativeTime }}</div>
     <!-- 关注用户 -->
      <FollowUser class="follow-btn" :datas='article' />
        
        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div class="article-content markdown-body" ref='des' v-html="article.content">

        </div>
          <!-- /加载完成-文章详情 -->
        <van-divider>正文结束</van-divider>
<!-- 文章评论列表 -->
<comment-list 
  :source="article.art_id" 
  :list="commentList"
 @onload-success='totalCommentCount=$event.total_count' 
 @reply-click="onReplyClick"
 />
        <!-- 底部区域 -->
    <div class="article-bottom">
      <van-button
        class="comment-btn"
        type="default"
        round
        size="small"
        @click="show=!show"
      >写评论</van-button>


      <van-popup v-model="show" round position="bottom"   >
<CommentPost type='a' @show='onPostSuccess' :target="article.art_id" />
      </van-popup>
      <!-- 评论按钮 -->
      <van-icon
        name="comment-o"
        :badge="totalCommentCount"
        color="#777"
      />
      <!-- 收藏组件 -->
     <CollectArticle  :arr='article' class="btn-item"/>

    <!-- 文章点赞 -->
  <like-article
class="btn-item"
v-model="article.attitude" 
:article-id="article.art_id"
/>
      <van-icon name="share" color="#777777"></van-icon>
    </div>
    <!-- /底部区域 -->
      </div>
    
 <div v-else>

    <!-- 加载失败：404 -->

      <div class="error-wrap"  v-if="errStatus==404">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div class="error-wrap" v-else>
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn" @click="load">点击重试</van-button>
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
 </div>

    </div>
    <!-- 评论回复弹出层 -->
<van-popup v-model="isReplyShow" position="bottom"
 :style="{ height: '100%' }" >

  <CommentReply  v-if="isReplyShow" :comment="currentComment"
   @close="isReplyShow = false" />

 
</van-popup>
  </div>
</template>

<script>
import { getArticleById } from '@/api/article.js'

import { ImagePreview } from 'vant'

// import { addFollow, deleteFollow } from '@/api/user'
import FollowUser from '@/components/follow-user'
// 文章收藏
import CollectArticle from '@/components/collect-article'
// 文章点赞
import LikeArticle from '@/components/like-article'
// 文章评论
import CommentList from './components/comment-list'
// 引入评论弹出层
import CommentPost from './components/comment-post'
// 评论回复
import CommentReply from './components/comment-reply'
// ImagePreview(['https://img01.yzcdn.cn/vant/apple-1.jpg','https://img01.yzcdn.cn/vant/apple-1.jpg']);
export default {
  name: 'ArticleIndex',
  components: {
    FollowUser,
    CollectArticle,
     LikeArticle,
     CommentList,
     CommentPost,
     CommentReply
  },
  props: {
    articleId: {
      type: [Number, String, Object],
      required: true
    },

  },
      provide: function() {
      //  #这个是选项，与data，props同级
    return {
    	articleId: this.articleId
    };
},
  data () {
    return {
      article: {},
      isLoading: true, // 文章加载状态
      errStatus: 0,//错误状态码
      images: [],// 图片预览
      followLoading: false,
      totalCommentCount:0,
      show:false,// 控制弹出层
      commentList:[]  //评论列表数据
      ,isReplyShow:false,// 评论回复弹出层
      currentComment: {} // // 当前点击回复的评论项
    }
  },
  computed: {},
  watch: {},
  created () {
    this.load()
  },
  mounted () {},
  methods: {

    // 获取文章
    async load () {
      try {
        this.isLoading = true;
        const { data } = await getArticleById(this.articleId)

        //  if (Math.random() > 0.5) {
        //         return JSON.parse('error')
        //     }

        this.article = data.data

        setTimeout(() => {
          const res = this.$refs.des
          const imgs = res.querySelectorAll('img')
          imgs.forEach((img, index) => {
            this.images.push(img.src)
            img.onclick = () => {
              ImagePreview({
                images: this.images,
                startPosition: index
              })
            }
          })
        })
        //  this.$nextTick(()=>{
        //    const res= this.$refs.des
        //    console.log(this.$refs.des);

        //  })
      } catch (err) {
        if (err.response && err.response.status === 404) {
          this.errStatus = 404
        }
      }
      this.isLoading = false
    } ,
    // 添加评论
    onPostSuccess(data){
      this.show=false;
      this.commentList.unshift(data.new_obj)
    },
    // 评论回复
    onReplyClick(comment){
 // 显示评论回复弹出层
    this.isReplyShow = true
 this.currentComment = comment
    }
  }
}
</script>

<style scoped lang="less">
@import './github-markdown.css';
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
     .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
   /deep/ .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>
